port/locale/strcoll.c

	strcoll.c revision 4297a3b0d0a35d80f86fff155e288e885a100e6d
/*
 * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
 *      at Electronni Visti IA, Kiev, Ukraine.
 *          All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include "lint.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "collate.h"

int
strcoll(const char *s, const char *s2)
{
    int len, len2, prim, prim2, sec, sec2, ret, ret2;
    const char *t, *t2;
    char *tt, *tt2;

    if (__collate_load_error)
        return (strcmp(s, s2));

    len = len2 = 1;
    ret = ret2 = 0;
    if (__collate_substitute_nontrivial) {
        t = tt = __collate_substitute(s);
        t2 = tt2 = __collate_substitute(s2);
        if ((tt == NULL) || (tt2 == NULL)) {
            errno = ENOMEM;
            if (tt)
                free(tt);
            if (tt2)
                free(tt2);
            /*
             * All we can do here is set errno, the application
             * is obliged to check it.
             */
            return (strcmp(s, s2));
        }
    } else {
        tt = tt2 = NULL;
        t = s;
        t2 = s2;
    }
    while (*t && *t2) {
        prim = prim2 = 0;
        while (*t && !prim) {
            __collate_lookup(t, &len, &prim, &sec);
            t += len;
        }
        while (*t2 && !prim2) {
            __collate_lookup(t2, &len2, &prim2, &sec2);
            t2 += len2;
        }
        if (!prim || !prim2)
            break;
        if (prim != prim2) {
            ret = prim - prim2;
            goto end;
        }
        if (!ret2)
            ret2 = sec - sec2;
    }
    if (!*t && *t2)
        ret = -(int)((uchar_t)*t2);
    else if (*t && !*t2)
        ret = (uchar_t)*t;
    else if (!*t && !*t2)
        ret = ret2;
end:
    free(tt);
    free(tt2);

    return (ret);
}